In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn ? Zn+2 + 2e- rxn B: 2 NH4+ + 2e- ? 2 NH3 + H2Which reaction is taking place at the cathode?
A. rxn B
B. rxn A
C. The reaction takes place at the electrode, not the cathode.
D. Both reactions are happening at both the anode and cathode.
E. Both reactions are happening are happening at the electrode.
Answer: A
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